Jet City Red RetroValves are very high gain, allowing the preamp to achieve gain characteristics not possible with standard vacuum tubes.

RetroValves are very low noise and have no potential for the microphonics sometimes characteristic of vacuum tubes. And because RetroValves operate with much less heat and consume less power, they reduce stress on the amplifier’s electronics.

Use RetroValves alongside vacuum tubes, or replace vacuum tubes in any ‘cocktail’ combination. They operate in any 12AX7 socket, in nearly any guitar amplifier.

Product Specifications

Blue RetroValves are lower gain than a standard 12AX7.Use RetroValves alongside vacuum tubes, or replace vacuum tubes in any “cocktail” combination. They operate in any 12AX7 socket, in nearly any guitar amplifier. RetroValves are so cool and advanced, they’re protected by US patents: 7,286,060; 7,408,401; and 7,482,863; as provided under license from ROBERTS AUDIO TECHNOLOGIES.